Slow loading websites are a major problem
Geographically, the closer your website visitors are to the content on your WordPress website, the faster the loading time speeds are.
Content Delivery Networks are teams of servers located all throughout the world, which contain copies of static media content on your WordPress website.
Visitors who are exploring your website will receive the WordPress website’s data from the server closest to their location, ensuring that they receive the best possible treatment from your WordPress website.
Common WordPress Mistakes: Not Using a CDN – Content Delivery Network
Today there are many options for CDN available globally, with Amazon even being a provider of CDN themselves.
As you can hopefully see, CDN is a powerful tool that can help differentiate your website from the millions of others in a relatively cheap way, so why wouldn’t you?